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'(No Model.) 2 Sh eetsSheet 1.

T.J.LEAVY. MAGHINE FOR THREADING SHEET METAL PIPES. No. 425,516.Patented Apr, 15, 1890.

(No Model.) 2 Sheets-Sheet 2. T. J. LBAVY MAG H INFFOR THREADING SHEETMET-AL PIPES.

No. 425,516. Patented Apr. 15, 1890.

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UNITED STATES PATENT @EErcE.

THOMAS J. LEAVY, OF CHICAGO, ILLINOIS, ASSIGNOR TO LUTHER A.

MARSHALL, OF

SAME PLACE.

MACHINE FOR THREADING SHEET-METAL PIPES.

SPECIFICATION forming part of Letters Application filed July 22, 1889-Patent No. 425,516, dated April 15, 1890.

Serial No. 818,264. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS J. LEAVY, a citizen of the United States,residing at Chicage, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Machines for ThreadingSheet-Metal Pipes, which is fully set forth in the followingspecification, reference being had to the accompanying drawings, inwhich Figure 1 represents a side elevation of a machine embodying myimprovements; Fig. 2, a plan view of the same; Fig. 3, a crosssection ofthe same, taken on the line 1 1 of Fig. 1; Fig. i, a detail plan-sectiontaken on the line 2 2 of Fig. 1; Fig. 5, an elevation of the threadingdevices and their shafts detached from the machine; Fig. 6, a detailsection taken on the line 3 3 of Fig. 1, and Fig. 7 an elevation of theend of a pipe threaded by this machine.

In the drawings, Figs. 1 to 4, inclusive, are upon the same scale, andFigs. 5 to 7 upon the same scale, but enlarged from that of thepreceding figures.

My invention relates to a machine for rolling a screw-thread upon metalpipes, instead of cutting the same in the dies which are usuallyemployed for this purpose. The invention consists in certainimprovements in the roller-dies and the means for operating them, whichwill be hereinafter more fully described and pointed out.

I will describe in detail a machine in which I have carried out myinvention practically in one way, and will then define more specificallyin claims the improvements which I believe to be new and wish to secureby Letters Patent.

In the drawings, A represents the frame in which the rollers aremounted, and which is itself supported in any suitable manner. In thedrawings it is shown mounted upon a pedestal A. This frame is of ageneral rectangular shape, the base a beinga plane bedpiece and the endpieces a being forlzs, as seen in Fig. 3 of the drawings, upon which ismounted and secured a cap-piece a A shaft B is mounted in suitablejournal-boxes in the lower part of this frame, and is provided with acrank b,by means of which it is turned, and

at the opposite end projects some distance beyond the supporting-frame,and has mounted upon this extremity and secured to the shaft a circulardie C,which is provided with a single flange c,running straight aroundthe body of the die. This die, therefore, constitutes the male member ofthe threading-dies. The second shaft D is mounted just above the shaft Band in suitable journal-boxes in the main frame; but this shaft is notarranged parallel to the shaft B. Its outer end, which is to carry thedie, is arranged directly over the lower shaft, so that it stands justabove the die C; but inward toward the frame it is inclined awayslightly to the right of the shaft B, as shown in Figs. 2 and 3 of thedrawings. A circular die E is secured upon the outer end of this shaftD, so that it will stand just over the die C, and is provided with twoflanges 6, running straight around the die and having aslightly-concaved groove 8' between them, which is adapted to receivethe flange c of the die below. This die e becomes, therefore, the femalemember of the roller threading-dies, and the two dies are arranged sothat the male die enters the groove of the female die, as shown in Figs.1 and 5 of the drawings; but the female die stands at an angle to themale die, as seen in Fig. 2 of the drawings.

The outer journal d of the shaft D is sus pended from the main frame bya rod extending upward through a portion a thereof, the upper end ofthis rod being threaded and provided with a nut n, whereby the suspendedbox may be adjusted vertically, so as to properly adjust the upper dieto the lower one. A screw-clamp F is also set in the frame at this endthereof immediately over the upper shaft, whereby the latter is helddown firmly to its adjusted position. This clamp and the device forsuspending and adjusting the journal Z) are of the same construction asin tinners corrugatiug-machines, which have been longknown and in publicuse. As their construction is perfectly well known, a specificdescription is unnecessary here.

The shafts B and D are provided, respectively, with slightly-taperinggear-pinions b and 61 which are arranged to engage with each other; butin order to do this properly the teeth of these pinions, instead ofbeing straight,vare inclined to the axis of the gear, as seen in Fig. 5of the drawings, and the angle of inclination should be the same as theangle between the two shafts.

An angular bracket G is fastened to the under side of thesupporting-frame, depending therefrom and then projecting outwardhorizontally underneath the threading-dies, and to this horizontalportion of the bracket a bar H is pivoted, as shown in Figs. 1 and 4 ofthe drawings. On this pivoted bar are blocks h, through which passupright posts I, which are movable vertically in said blocks and whichare secured in any position by setscrews h. The blocks h are slippedupon the bar H, which is angular in cross-section, to prevent theirturning, and the blocks are adjustable on said bar, being fixed in anyposition by ordinary set-screws.

Upon the upper ends of the posts 1 is a receiver J, of cylindrical formand made in two parts, the lower portion j being fastened to the posts,while the upper portion j is hinged to the lower, so that it may bethrown up therefrom. This receiver forms a bearing and support for theinner end of the pipe K which is to be threaded, the outer end beingleftunsupported unless it is so long as to require additional support,in which case it may be held up-by any movable device. The pipe is freeto move lengthwise in the receiver J, and must also be free to move inthe same direction on any other support which may be provided. Now, theend of the pipe is run in between the threading-dies, the lower dieentering the pipe and the upper one being raised by loosening its shaftsufficiently to permit the proper adjustment of the pipe. The upper dieis then forced down upon the pipe over thelower die by means of thescrewclamp operating upon its shaft, and the theshafts are rotated bymeans of the crank 1). Owing to the inclination of the upper shaft tothe lower, the revolution of the roller-dies will form a screw-flange 70on the pipe; rotating the, pipe between them and at the same timefeeding it forward by reason of the angular arrangement of the dies andtheir shafts.

If the pipe to be threaded is always set in line with the lowerdie-shaft, as shown in the drawings, the thread formed thereon will ofcourse always be of the same pitch; but the pitch may be varied bychanging the position of the pipe, so that when entered between the diesit will be inclined more or less to the axis of the said lower shaft,and it is for this adjustment that the support H is pivoted so that itmay be swung around to one side or the other. In order to determine theposition of this pivoted support for any pitch desired, a pointer L isfastened to its inner end and directly below it on the bracket G is anarc g, graduated to indicate the exact position of the pointer for anygiven pitch. A gage M is mounted on a supporting-arm m, arranged at oneside of the die-shafts and mounted in the main frame in a bearingthrough which it may slide out and in horizontally. The gage determinesthe distance to which the pipe is to be entered between the dies, and sodetermine the length of the section which is to be threaded, and thisgage is adj Listed-by moving its support back and forth, the latterbeing secured in any position desired by means of a set-screw m.

The machine, as will be seen, is simple-in construction but efficient inits operation, and is sufficiently accurate for ordinary work.

I do not wish to be understood as limiting myself to the preciseconstruction and arrangement of all the parts herein shown anddescribed, for changes may be made in mechanieal details and in therelative arrange- Y ment of some of the devices thereof without losingthe characteristic features of my invention, the principal one of whichis the angular arrangement of the dies, whereby a single thread and asingle groove are sufficient and the pipe is fed automatically by theoperation of the dies themselves, while the latter have no movementexcept a rotary one- Having thus described my invention, what I claim asnew, and desire to secure by Letters Patent, is-

1. In a machine for threading sheet-metal pipes, a revolving male dieprovided with a single flange, in combination with a revolving femaledie provided with a single groove and arranged with its axis at an angleto the axis of the former die, substantially as and for the purposesspecified.

2. In a machine for threading sheet-metal pipes, the shaft 13, incombination with the circular die 0, secured upon one end of said shaftand perpendicular to the axis of the the said shaft 13, thecorresponding circular die E, secured on the end of said shaft D andperpendicular to the axis thereof, and the pinions b 6 substantially asand for the purposes specified.

3. In a machine for threading sheet-metal pipes, a pair of revolvingroller-dies mounted on axes arranged at an angle to each other, incombination with a pivoted support for the pipe, whereby the latter maybe set at different angles to the axes of the said dies, substantiallyas and for the purposes specitied.

at. The shafts B and D, arranged at an angle to each other, incombination with the roller-dies O and E, mounted, respectively, on saidshafts and perpendicular to the respective axes thereof, and thedie-support H, pivoted just below the said dies and extending outwardfrom the latter, substantially as and for the purposes specified.

' THOS.

' WVitnesses:

ALICE McIvER, J. M. TEACHER.

J. LEAVY.

latter, the shaft D, arranged at an angle to

